Freezing is another great way to preserve herbs, and some say frozen herbs are superior in flavor to dried ones. You also don’t have to worry about mold or insects infesting your frozen herbs.
Herbs are best harvested when they are at their peak. Cut them when they are not wilted, brown, or spent from flowering.
If you’ve grown your herbs yourself and you know there were no chemicals sprayed on them, then you don’t necessarily have to wash them.
One way to freeze herbs is simply to put entire sprigs in a single layer in a Ziploc plastic bag, suck the air out with a straw, and seal.
You might want to use small freezer bags to freeze the leaves so you can avoid opening and re-sealing a large bag too often.
If you like, you can chop your herbs first. Place the chopped pieces into ice cube trays, add a bit of boiling water, and freeze. Then pop them out of the trays and freeze them in Ziploc bags. Add a cube or two to soups and stews.